mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-12-10 02:50:09 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 11

Implement PEP 238 in its (almost) full glory.

Browse source 
This introduces:

- A new operator // that means floor division (the kind of division
  where 1/2 is 0).

- The "future division" statement ("from __future__ import division)
  which changes the meaning of the / operator to implement "true
  division" (where 1/2 is 0.5).

- New overloadable operators __truediv__ and __floordiv__.

- New slots in the PyNumberMethods struct for true and floor division,
  new abstract APIs for them, new opcodes, and so on.

I emphasize that without the future division statement, the semantics
of / will remain unchanged until Python 3.0.

Not yet implemented are warnings (default off) when / is used with int
or long arguments.

This has been on display since 7/31 as SF patch #443474.

Flames to /dev/null.
This commit is contained in:
Guido van Rossum 2001-08-08 05:00:18 +00:00
parent 074c9d2b20
commit 4668b000a1
19 changed files with 476 additions and 226 deletions
Download patch file Download diff file Expand all files Collapse all files

45
Objects/floatobject.c
View file

@ -557,6 +557,21 @@ float_pow(PyObject *v, PyObject *w, PyObject *z)
return PyFloat_FromDouble(ix);
}
static PyObject *
float_int_div(PyObject *v, PyObject *w)
{
PyObject *t, *r;
t = float_divmod(v, w);
if (t != NULL) {
r = PyTuple_GET_ITEM(t, 0);
Py_INCREF(r);
Py_DECREF(t);
return r;
}
return NULL;
}
static PyObject *
float_neg(PyFloatObject *v)
{
@ -678,19 +693,23 @@ static PyNumberMethods float_as_number = {
(unaryfunc)float_int, /*nb_int*/
(unaryfunc)float_long, /*nb_long*/
(unaryfunc)float_float, /*nb_float*/
0, /*nb_oct*/
0, /*nb_hex*/
0, /*nb_inplace_add*/
0, /*nb_inplace_subtract*/
0, /*nb_inplace_multiply*/
0, /*nb_inplace_divide*/
0, /*nb_inplace_remainder*/
0, /*nb_inplace_power*/
0, /*nb_inplace_lshift*/
0, /*nb_inplace_rshift*/
0, /*nb_inplace_and*/
0, /*nb_inplace_xor*/
0, /*nb_inplace_or*/
0, /* nb_oct */
0, /* nb_hex */
0, /* nb_inplace_add */
0, /* nb_inplace_subtract */
0, /* nb_inplace_multiply */
0, /* nb_inplace_divide */
0, /* nb_inplace_remainder */
0, /* nb_inplace_power */
0, /* nb_inplace_lshift */
0, /* nb_inplace_rshift */
0, /* nb_inplace_and */
0, /* nb_inplace_xor */
0, /* nb_inplace_or */
float_int_div, /* nb_floor_divide */
float_div, /* nb_true_divide */
0, /* nb_inplace_floor_divide */
0, /* nb_inplace_true_divide */
};
PyTypeObject PyFloat_Type = {